Thanks for the answer, but I guess I did not clairfy what I needed. That problem was given to me, and we were told to explain it. We just finished learning about energy. And I am having trouble answering it. So if you oculd try to explain why that I would greatly appreciate it, but if not thanks anyway.

The answer has to do with the fact that a nuclear power plant is not a "machine." A machine is a device that manipulates an input force. A nuke plant is an "energy converter device" that takes the energy bound by uranium atoms and releases it. Compare that to a lever. Ever seen a lever go boom?